TO: Mayor and Commissioners
FROM: John Morgan, Director of Environmental Services
THROUGH: Chief Neal de Jesus, Interim City Manager
DATE: February 7, 2017
Title
Amendment No.1 to Service Authorization NO. 12-21 to Kimley Horn and Associates, Inc. for assistance with resolving the chlorine residual depletion in the water distribution system.
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Recommended Action:
Recommendation
Motion to Approve Amendment No.1 to Service Authorization No. 12-21 with Kimley Horn and Associates, Inc. in the amount not-to-exceed $34,702.00, to provide additional professional engineering services for treatment process changes to resolve the chlorine residual depletion issues experienced in the water distribution system.
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Background:
On May 17, 2016, City Commission approved Service Authorization No. 12-21 with Kimley Horn and Associates, Inc. (KHA) in an amount not-to-exceed $123,269, for services in performing an analysis and study of the water distribution system to address the chlorine residual depletion.
Services provided by (KHA) included evaluation of the existing distribution system’s hydraulics, as well as the existing chlorine and ammonia injection facilities, and recommendations to resolve the issues. This included thoroughly evaluating and examining the injection systems for flow rates and location of injection of specific type of chemicals, updating the water model for running scenarios to determine areas of water age, bench testing and analysis of the formation of disinfection by-products as it relates to free chlorine in order to maintain compliance with regulated limits, conducting trial runs of the hydraulic modeling utilizing anticipated enhancements, and an analysis of the use and operations of the remote chlorine booster stations.
A preliminary analysis revealed that controlling the ammonia would be the first step towards providing resolution to the chlorine residual depletion issue. This amendment will expand and refine services by the cons...
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